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6a3cb6b1bd
Make sure that numbers never overflow uint32_t in inet_network to properly validate octets encountered in IPv4 addresses. Avoid malloca in NSS networks file code because /etc/networks lines can be arbitrarily long. Instead of handcrafting the input for inet_network by adding ".0" octets if they are missing, just left shift the result. Also, do not accept invalid entries, but ignore the line instead. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* Copyright (C) 2013-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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/*
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* Internet network address interpretation routine.
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* The library routines call this routine to interpret
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* network numbers.
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*/
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uint32_t
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__inet_network (const char *cp)
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{
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uint32_t val, base, n, i;
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char c;
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uint32_t parts[4], *pp = parts;
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int digit;
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again:
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val = 0; base = 10; digit = 0;
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if (*cp == '0')
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digit = 1, base = 8, cp++;
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if (*cp == 'x' || *cp == 'X')
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digit = 0, base = 16, cp++;
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while ((c = *cp) != 0) {
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if (val > 0xff)
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return (INADDR_NONE);
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if (isdigit(c)) {
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if (base == 8 && (c == '8' || c == '9'))
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return (INADDR_NONE);
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val = (val * base) + (c - '0');
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cp++;
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digit = 1;
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continue;
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}
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if (base == 16 && isxdigit(c)) {
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val = (val << 4) + (tolower (c) + 10 - 'a');
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cp++;
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digit = 1;
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continue;
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}
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break;
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}
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if (!digit)
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return (INADDR_NONE);
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if (pp >= parts + 4 || val > 0xff)
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return (INADDR_NONE);
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if (*cp == '.') {
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*pp++ = val, cp++;
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goto again;
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}
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while (isspace(*cp))
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cp++;
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if (*cp)
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return (INADDR_NONE);
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if (pp >= parts + 4 || val > 0xff)
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return (INADDR_NONE);
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*pp++ = val;
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n = pp - parts;
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for (val = 0, i = 0; i < n; i++) {
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val <<= 8;
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val |= parts[i] & 0xff;
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}
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return (val);
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}
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libc_hidden_def (__inet_network)
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weak_alias (__inet_network, inet_network)
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